A survey of the groundwater fauna of The Netherlands has revealed the presence of 4 species of Parastenocarididae, viz. Parastenocaris fontinalis Schnitter & Chappuis, 1915, P. tumida Kiefer, 1961, P. germanica Kiefer, 1936, and P. nolli Kiefer, 1938, the latter two being new for The Netherlands. P. tumida is only imperfectly known, but there is enough material so that a full description can now be given not only of the female but also of the male hitherto unknown.